Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September indicates a shift in the average high-temperature, from August's warm 80.2°F (26.8°C) to an agreeable 70.3°F (21.3°C). Despite a significant disparity with daytime temperatures, an average low-temperature of 43.7°F (6.5°C) is recorded in De Smet, Idaho, during September.Humidity
In De Smet, Idaho, the average relative humidity in September is 59%.Rainfall
In September, in De Smet, the rain falls for 7.4 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. Throughout the year, there are 145.2 rainfall days, and 25.12" (638mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in De Smet. September is the first month it typically snows in De Smet. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In De Smet, during the entire year, snow falls for 70.2 days and aggregates up to 59.69" (1516mm) of snow.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 6:08 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:28 pm PDT.
Sunshine
In De Smet, the average sunshine in September is 9.7h.UV index
In September, the average daily maximum UV index in De Smet is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
What is the temperature in September in De Smet?
What is the average humidity in September in De Smet?
How much does it rain in De Smet in September?
When does it start to snow in De Smet?
What is the average length of the day in September in De Smet?
When are sunrise and sunset in September in De Smet?
How long on average sun shines in September in De Smet?
What is the UV index reading in September in De Smet?
Average temperature in September
De Smet, ID
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (31.8°F).
- Average low temperature in September: 43.7°F
The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure in September
De Smet, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in September
De Smet, ID
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is April (5mph).
The calmest months (with the lowest average wind speed) are August and September (4mph).
Average humidity in September
De Smet, ID
- Average humidity in September: 59%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
De Smet, ID
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is January (3.66").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
De Smet, ID
- Average rainfall days in September: 7.4 days
The month with the highest number of rainy days is April (18.7 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in September
De Smet, ID
- Average snowfall in September: 0.08"
The month with the highest snowfall is January (16.22").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
De Smet, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (16.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
De Smet, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The months with the least sunshine are February and December (Average sunshine: 3h and 30min).
Average sunshine days in September
De Smet, ID
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is July (25.2 days).
The month with the least sunshine days is March (7.5 days).
Average UV index in September
De Smet, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
De Smet, ID
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
De Smet, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
De Smet, Idaho, USA
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